DNA technology allows investigators to match DNA profiles obtained from crime scene
samples to DNA material in a National DNA Database. This database usually contains
DNA profiles from known offenders. What makes this special is that the profiles
are matched indirectly; between crime scene profile and database profile a certain
family relation is assumed. This means that investigaters are not looking for
the actual person who left the DNA profile at the crime scene, but for his/her sibling,
parent, etc.

Indices

The farther individuals are located from each other in a (related) pedigree, the less
likely it is they share DNA material. Thus only a limited number of these familial relations yield
sufficient information to be useful. This information is usually computed as an index (the ratio between the
likelihoods of two hypotheses).

Bonaparte Familial Search computes the following LR′s/indices

Direct

Paternity Index (PI)

Sibling Index (SI)

Half Sibling Index (HSI)

The Bonaparte Familial Search module implements several of the statistical options as described in